Masonry anchorage device



Fatented Feb. 26, 1924..

EEYMAN ROSENBERG, OF NEW YORK, N. Y.

MASONRY .ANCHORAGE DEVICE Application led. April 12, 1923. Serial No. 631,591.

vin nails and like anchoring means, and has as its object the provision of easily and quickly operated means for efecting a permanent anchorage or connection to a wall of masonry, such as brick, concrete, porous tile, sand-stone, and like substances characterized by lack of elasticity or capacity for free expansion, and susceptiblev ofr..sbeing crumbled.

' With this and further objects in view as will in part hereinafter become apparent and in part be stated, the invention comprises certain novel constructions, combinations and arrangements of parts as subsequently specified and claimed.

In the accompanying drawings,-

Figure 1 is a' view in side elevation of a device embodying the features of the present invention.

Figure 2 is an end view thereof, looking at the point.

Figures 3 and 4 are transverse sections taken respectively on lines 3-3 and 4-4 of Figure 1.

Referring to the drawings by numerals,

1) indicates a cylindrical body preferably having a head 2 at one end and terminating in a penetrating point 3 at the other. The point 3 is the product of the tapered end portion of the body 1, which tapered end portion instead of being finished like a cone is provided with longitudinal out-away portions or grooves 4, 4, leavingl cutting edges 5, 5. The cutting edges 5 converge at the point 3, and considering the device as arranged in the position shown in Figure 1, the said cutting edges extend upwardly and terminate at the surface of the body 1, the grooves 4 extending upward beyond the terminus of the cuttlng edges 5. There are preferably four of the grooves 4, making our of the cutting edges 5.

Formed integral with and outstanding from the body 1 are parallel ribs or threads 6, 6, each substantially triangular in cross section, as clearly seen in Figure 4, the apex of the triangle outstanding` and thel base blending into and formed inte -ral with the body 1. Thus each thread or ri 6 is formed with a cutting edge throughout its 1ength,. and each rib or thread 6 preferably extends to and blends into the head 2, and also extends to the terminus of the full diameter of the body 1. That is to say, each rib or thread 6 extends to the margin of a groove 4, and at such Inargin terminates with a curved end portion 7 blending into the material of the body 1 and presenting a continuation, at the end of each rib 6, of the cutting edgel of that rib. The number of ribs 6, like the number of grooves 4, may be varied, but there are -preferably six ribs 6 arranged as shown in Figure 1, so that they 76 may be saidv to be arranged in diametricallyopposite pairs, one pair being of greatest length, a second pair of intermediate length, and a third pair of shortest length, presenting the stepped relation seen at the lower 60 terminal portion of body 1 in Figure 1. The advantage of this relation will become apparent in the discussion of the Operation of the device hereinafter. Each thread or rib 6 is given a slight pitch or angular slant 65 about the body 1, and, in practice, each of the longest ribs or threads should extend4 one-third the way around the body in the length of the body, or, in other words, an-

gularly 120 when the body is made one- 00 fourth of an inch in4 diameter and one and three-eighths inches long from the. point of blending into the head 2 to the upper terminus ofy one of the cutting edges 5. While the showing ,in the drawing is that of a 06. much larger device, or may be said to be greatly magnified, the proportions are maintained which will enable the determination of the preferred relative transverse area of each rib or thread 6. mo

The body 1 and its connected parts are formed preferablv of soft steel and then case-hardened. The preferable method of case-hardenin is known as the cyanide process, but 1t should be understood that the essential characteristic of the finished Structure is its eifective hardness,.especially of those parts employed for cutting, as hereinafter stated, and it is not a part of the present invention as to how the hardening 1,10

is efl'ected. It is of primal importance, however, that the penetrating point with/i 2- cutting edges 5 and the riba or threads 6 shall be of sufiicient hardness to cut the wall into which the parts are to be forced with substantially no injury to the point or threads. lt should thus be apparent that the body 1 itself and the head 2 do not require harde-ning, but when the device is hardened by the cyaniding process, these parts are hardened as an incident, and the hardened condition may be of value in pre- Ventinginjury to the surface ofthe body in contacting withabrasive portions of the wall into which it enters.

In conducting the preferred operation With the present improved anchorage device, the operator manually holds the body 1 in position with the point 3 .contacting with the surface of the wall to receive the anchor, and ,then taps with a hammer on the head 2 while manually rotating or inoving the body 1 angularly, so that the penetrating point enters the wall after the fashion of a masonry drill. This action is kept up until the longest threads of threads 6 come in contact With the exposed surface of the wall. The operator then discontinues the rotary motion, and taps ``the head 2 for driving the anchor directly into the wall, and in so doing causes the longest threads 6 to enter the wall and cause the body 1 to rotate slightly as it advances, and then the second or intermediate length threads en-' gage the' wall, and finally the shortest threads engage the wall, and all tend to turn the anchor? on its longitudinal axis. The rounded ends 7 of the threads 6 insure ready entry of the threads in the body of the wall in a manner to form grooves in such wall, which grooves accommodate the threads and provide for efi'ective anchorage thereof and of the body 1. It should be understood that any masonry substance susceptible of being crurnbled by the drill action of a penetrating point will have a hole or recess formed in it by the initial action above described of slightly greater diameter than the diameter of the bodyi1,so that as the anchor is driven further in during engagement of the threads 6 with the wall, a slight space is left between the surrounding wall and the entered portions of the body 1, through which space escapes the crumbled substance formed by the drill action of the point. This drill action continues as the point advances into the masonry incident'to the angular movement caused by the threads 6, -and the `Opening thus formed for the body 1 continues to be slightly larger than the body, so that the crumbled substance may continue to discharge out along the grooves 4 into the valleys between the threads, and thence to the outside of the wall. This action is continued until the anchor penetrates the wall to the required extent. If the anchor alone is mtended to engage the wall, it is neeaaoe left at any point desired in a location with the head 2 either resting against the wall or spaced therefrom to the distance required according to the use to be subsequently made of the anchor. lt is obvious, of course, that when a board or Strip of material is to be fastened to a Wall, the anchor is passed through such board or Strip before the final driving action occurs, that is, the actionoperated only sufiiciently for producing the initial Opening in the wall of a depth required to allow the threads 6 to begin to act. It Will be noted also that if such a drill should be used until a bore or Opening is formed in the Wall of practically the length of the body of the anchoring device, suchV anchoring device couldbe effectively applied by being driven into such Opening while the threads or ribs 6 cut their way and form co-operating anchoring grooves. The drill, when used, must be of the requisite diameter, approximately indentical with that of the body portion 1, for producing an Opening -or bore in the wall of a diameter only slightly larger than the diameter of said body portion 1, the increased diameter of the bore i being due, as abovestated, to the characteristic of the material of Itlfe wall which causes it to crumble When cut or broken.

It will be observed also that in whatever Way the Operation is carried out, the anchorage device does the material of the wall apart, and, therefore, does not tend to split or crack the same. The action is one of cutting away and crumbling the substance of the wall and not of expanding it, such as might occur were the instrument driven into a piece of wood or like elastic material.

While as above stated, the present improved anchorage device is especially well adapted for use in masonry and may be driven' directly into a brick or like Crumbling substance for producing efiective anchorage thereto, it is also found to be capable of etfective use as an anchorage device in metal or for connecting sheets of metal, when applied after the manner set forth in detail in my co-pending application, Serial i o. 502,972, filed September 24, 1921. There is, therefore a genus of which the specific disclosures of said co-pending application not "injuriously Wedge neenaoe cleims of neither of these two applicatione have been made broad enough to read upon the subject matter of the other, because the generic claims and the otherwise broader claims covering whatever is in common between these two applications and also covering matter not specifically claimed in this aplioation are presented in my third co-pending application filed January 25, 1924, and designated by Serial No. 688,423.

What is olaimed is 1. vA inasonry anohorage devioe'comprisinw a hody having a head at one terminus, a ardened penetrating oint at the other, and high pitched three s extending along the body.

2. A masory anohorage devioe oomprisa suhstantially oylindrical .body terminating in a hardened drill-like point at one end and having an outstanding thread extending along the hody et a oomparatively high niteh.

3 inasonry anohorage det'ice comprisa oodyhaving a drillv-lile point, and a plnrality of ontstanding hardened threads extendino' along the oody at a eomparatively high pitoh..

A masonry anchora e device oompris= a suhstantially yeyl'n'irical hody having a hardened tip at one end formed with ontting body heing fornied with a high pitohed thread hetween the ti; andhead,

5.. A reasonry nnoora e device voornprisf= inrf a snhstentially oylin'rioal hodi having a hardenerl9 tapered tip :torrned vvit entting i edges, and also havin .hardened threads en= tending along the he y at arelatively high pitoh.

t., A masonry anehora e device eornprising a suhstantially oylinrieal hod' having o hardened, taipered tip forrned with eutting edges, and also having1 hardened threads en'- tending along the hody at a relatively high pitoh, the threads entending trom the tip to edges, and a head at the other end? the..

ubdstantially the opposite terminus of the 7. A masonry anehora devioe comprieing a substantially oylin rical hod having a hardened, tapered tip formed wit outting edges, and also havin hardened threads ex? tending along the bo y at a relatively high pitch, the threads extending from. various points about the tip at difierent distances in the length of the body.

8. A masonry anohora e device oonnpris1 ing a substantially oylin ioal hooly having a tapered tip formed with grooves providing outting edges oonvergin to a point at the terminus of the tipv t e hody heing1 tormed With. threads extending longitndia nelly thereof at a relatively high. oitoh and lapping the grooves of the tip.

9. A masonry anohorage device eornprisv ing a suhstantially oylindrical hody havingl e tapered tin tormed With grooves orovidingg entting edges oonversing to a point at the terminus ot the tip9 he hody hein torrned with threads extending longitudina ly therem of at a relatively high pitch and lapaping theJ grooves oi2 the ti4 the onttingedges threads loeing her `ened sntdciently for poneo trating the rnasonry sulostantially Withont injury to'snoh ontting edges and threads..

" w.. A rnasonry anohorage devioe oornpris= ing a sulostantially oylindrieal leody having a tapered tip forrned With grooves provide ing ontting edges oonverginw to a point at the terminus of the tio9 the hody heing torrned With threads entendirrfl7 longitnddn nelly thereof at a relative high piton lepping the grooves of the tip, the Ientire strnoture heing torrned ot oase-hardened metal.

` n testirnon whereo lI ,ethx my signatnre in presenoe o two vvitnesses.

HEYMAN- RSENBERQ Witnesses:

Loors Sovonnrn,

Snnon Soronnrn 

